I've not done Tunisian crochet in a long time. Could you just work across half the stitches for however many rows you want the slit in the scarf to be and then come back and work the second half, rejoining it all when you get to the same row? It works in knitting or crochet. You'd need to hold the stitches you aren't working somehow and use a second ball of yarn or the other end of the same ball to work the second half. As I said, it's been a long time since I worked Tunisian and I may be forgetting something important.

__________________~ GG

Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper

As a beginner, are you aware that Tunisian tends to curl? You might want to try a different stitch pattern to help counteract the curl. The only free pattern I came across is Checkered Tunisian Keyhole Scarf. The best I can tell from looking at the pattern is that the slit is worked as I thought - work half the stitches to the length desired then go back and work the other half to match. I did notice that one stitch is skipped between the halves and didn't see how it's dealt with. I think you can figure it out. Try looking at the pattern and seeing how it says to do it and then see how to apply that to your project. I hope to see photos of your progress as well as the FO!

When I was really interested in Tunsian crochet, before I learned to knit, I had a really hard time finding info and patterns online. There were books for sale but I wasn't to the point of wanting to buy books. You might see if your library has any books available.

__________________~ GG

Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper

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